High resolution lens module

ABSTRACT

A lens module includes a first lens having positive refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive or negative refractive power, and a sixth lens having negative refractive power. One or more inflection points may be formed on an image-side surface of the sixth lens.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and benefit of Korean PatentApplication Nos. 10-2014-0073657, filed on Jun. 17, 2014, and10-2014-0137760, filed on Oct. 13, 2014, with the Korean IntellectualProperty Office, the disclosures of which are incorporated in theirentireties herein by reference.

BACKGROUND

Some embodiments of the present disclosure may relate to a lens modulehaving an optical system including six or more lenses.

Lens modules, mounted in camera devices provided in portable terminals,commonly include a plurality of lenses. For example, such a lens modulemay include six lenses, in order to provide an optical system havinghigh resolution.

However, in the case that such an optical system having high resolutionis configured using a plurality of lenses, as described above, a focallength (the distance from an object-side surface of a first lens to animage-sensing surface) of the optical system may be increased. In thiscase, it may be difficult to mount the lens module in a relatively thindevice or portable terminal. Therefore, the development of a lens modulein which a length of the optical system is reduced may be needed.

Patent Documents 1 to 4 listed below relate to art associated with thelens module.

RELATED ART DOCUMENT

-   (Patent Document 1) U.S. Pat. No. 8,477,431-   (Patent Document 2) U.S. Patent Application Publication No.    2012/0188654-   (Patent Document 3) Japanese Patent Laid-Open Publication No.    2011-085733-   (Patent Document 4) U.S. Patent Application Publication No.    2012/0194726

SUMMARY

Some exemplary embodiments in the present disclosure may provide a lensmodule having high resolution.

According to an aspect of the present disclosure, a lens module mayinclude: a first lens having refractive power and a convex object-sidesurface; a second lens having refractive power and a convex object-sidesurface; a third lens having refractive power and a convex object-sidesurface; a fourth lens having refractive power, both surfaces of thefourth lens being convex; a fifth lens having refractive power and aconvex image-side surface; and a sixth lens having refractive power anda concave image-sided surface. One or more inflection points may beformed on the image-sided surface of the sixth lens.

According to another aspect of the present disclosure, a lens module mayinclude: a first lens having positive refractive power; a second lenshaving positive refractive power; a third lens having refractive powerand a convex image-side surface; a fourth lens having refractive power;a fifth lens having negative refractive power; and a sixth lens havingrefractive power. One or more inflection points may be formed on animage-side surface of the sixth lens.

Other embodiments are also described. The above summary does not includean exhaustive list of all aspects of the present invention. It iscontemplated that the invention includes all lens modules that can bepracticed from all suitable combinations of the various aspectssummarized above, as well as those disclosed in the Detailed Descriptionbelow and particularly pointed out in the claims filed with theapplication. Such combinations have particular advantages notspecifically recited in the above summary.

BRIEF DESCRIPTION OF DRAWINGS

The above and other aspects, features and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a configuration diagram of a lens module according to a firstexemplary embodiment of the present disclosure;

FIG. 2 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 1;

FIG. 3 is a table illustrating characteristics of lenses illustrated inFIG. 1;

FIG. 4 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 1;

FIG. 5 is a configuration diagram of a lens module according to a secondexemplary embodiment of the present disclosure;

FIG. 6 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 5;

FIG. 7 is a table illustrating characteristics of lenses illustrated inFIG. 5;

FIG. 8 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 5;

FIG. 9 is a configuration diagram of a lens module according to a thirdexemplary embodiment of the present disclosure;

FIG. 10 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 9;

FIG. 11 is a table illustrating characteristics of lenses illustrated inFIG. 9;

FIG. 12 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 9;

FIG. 13 is a configuration diagram of a lens module according to afourth exemplary embodiment of the present disclosure;

FIG. 14 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 13;

FIG. 15 is a table illustrating characteristics of lenses illustrated inFIG. 13;

FIG. 16 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 13;

FIG. 17 is a configuration diagram of a lens module according to a fifthexemplary embodiment of the present disclosure;

FIG. 18 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 17;

FIG. 19 is a table illustrating characteristics of lenses illustrated inFIG. 17;

FIG. 20 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 17;

FIG. 21 is a configuration diagram of a lens module according to a sixthexemplary embodiment of the present disclosure;

FIG. 22 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 21;

FIG. 23 is a table illustrating characteristics of lenses illustrated inFIG. 21;

FIG. 24 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 21;

FIG. 25 is a configuration diagram of a lens module according to aseventh exemplary embodiment of the present disclosure;

FIG. 26 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 25;

FIG. 27 is a table illustrating characteristics of lenses illustrated inFIG. 25;

FIG. 28 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 25;

FIG. 29 is a configuration diagram of a lens module according to aneighth exemplary embodiment of the present disclosure;

FIG. 30 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 29;

FIG. 31 is a table illustrating characteristics of lenses illustrated inFIG. 29;

FIG. 32 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 29;

FIG. 33 is a configuration diagram of a lens module according to a ninthexemplary embodiment of the present disclosure;

FIG. 34 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 33;

FIG. 35 is a table illustrating characteristics of lenses illustrated inFIG. 33;

FIG. 36 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 33;

FIG. 37 is a configuration diagram of a lens module according to a tenthexemplary embodiment of the present disclosure;

FIG. 38 is a curve illustrating aberration characteristics of the lensmodule illustrated in FIG. 37;

FIG. 39 is a table illustrating characteristics of lenses illustrated inFIG. 37; and

FIG. 40 is a table illustrating aspherical surface coefficients of thelens module illustrated in FIG. 37.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present disclosure will be described indetail with reference to the accompanying drawings.

The disclosure may, however, be embodied in many different forms andshould not be construed as being limited to the embodiments set forthherein. Rather, these embodiments are provided so that this disclosurewill be thorough and complete, and will fully convey the scope of thedisclosure to those skilled in the art.

In the drawings, the shapes and dimensions of elements may beexaggerated for clarity, and the same reference numerals will be usedthroughout to designate the same or like elements.

In addition, in embodiments of the present specification, a first lensrefers to a lens closest to an object (or a subject), and a sixth lensrefers to a lens closest to an image-sensing surface (or an imagesensor). Further, the term ‘first lens surface’ or ‘first surface’refers to a lens surface oriented to or facing the object (or thesubject) in the lens module, and the term ‘second lens surface’ or‘second surface’ refers to a lens surface oriented to or facing theimage-sensing surface (or the image sensor) in the lens module. Inaddition, unless otherwise indicated herein, in embodiments of thepresent specification, units of radii of curvature, thicknesses, TTLs(or OALs) (optical axis distances from a first surface of the first lensto the image-sensing surface), SLs, IMGHs (image heights), and BFLs(back focus lengths) of the lenses, an overall focal length of anoptical system, and a focal length of each lens may be in millimeters(mm). In addition, unless otherwise indicated herein, thicknesses oflenses, gaps between the lenses, TTLs (or OALs), and SLs may bedistances measured based on an optical axis of the lenses. Further, indescriptions of lens shapes unless otherwise indicated herein, themeaning that one lens surface is convex is that an optical axis portionof a corresponding surface is convex, and the meaning that one lenssurface is concave is that an optical axis portion of a correspondingsurface is concave. Therefore, although it is described that one lenssurface is convex, an edge portion of the lens or a peripheral lensportion of the optical axis may be concave. Likewise, although it isdescribed that one lens surface is concave, an edge portion of the lensmay be convex. In addition, in the following detailed description andthe claims, it is to be noted that an inflection point refers to a pointat which a bent is changed in a portion that does not intersect with theoptical axis.

In some embodiments of the present disclosure, a lens module may includean optical system including a plurality of lenses. For example, theoptical system of the lens module may include six or more lenses havingrefractive power. However, the lens module is not limited to six lenses.The lens module may further include other components or additional oneor more lenses. For example, the lens module may include a stop forcontrolling an amount of light. In addition, the lens module may furtherinclude an infrared cut-off filter for removing infrared light.Additionally, the lens module may further include an image sensor (forexample, an imaging device) converting an image of a subject incidentthrough the optical system into an electrical signal. Further, the lensmodule may further include a gap maintaining member adjusting gapsbetween lenses. In addition to six lenses, one or more lenses may bearranged in front of the first lens, behind the sixth lens, or betweenthe first and sixth lenses.

First to sixth lenses may be formed of materials having a refractiveindex different from that of air. For example, the first to sixth lensesmay be formed using a plastic material or glass. At least one or more ofthe first to sixth lenses may have an aspherical surface. For example,only the sixth lens of the first to sixth lenses may have the asphericalsurface. As another example, respective at least one surfaces of all ofthe first to sixth lenses may be aspherical. Here, the asphericalsurface of each lens may be represented by Mathematical Expression 1.

                            [Mathematical  Expression  1]$Z = {\frac{{cr}^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}r^{2}}}} + {Ar}^{4} + {Br}^{6} + {Cr}^{8} + {Dr}^{10} + {Er}^{12} + {Fr}^{14} + {Gr}^{16} + {Hr}^{18} + {Jr}^{20}}$

Here, c is an inverse number of a radius of curvature of a correspondinglens, K is a conic constant, and r is a distance from any point on anaspherical surface to an optical axis. In addition, constants A to Jrefer to sequential 4-th order to 20-th order aspherical coefficients.In addition, Z indicates sag at any point on an aspherical surfacepositioned to be spaced apart from the optical axis by a distance r.

The optical system configuring the lens module may have an F No. of 2.3or less. In this case, the subject may be clearly imaged. For example,the lens module according to the exemplary embodiment of the presentdisclosure may clearly capture an image of the subject even underconditions of low illumination (for example, 100 lux or less). However,F No. of the optical system may be greater than 2.3.

The optical system of the lens module may satisfy the followingConditional Expression.1.3<f1/f<2.5  [Conditional Expression]

Here, f is an overall focal length [mm] of the lens module, and f1 is afocal length [mm] of the first lens. The Conditional Expression above isa numerical condition for optimizing refractive power of the first lens.For example, the first lens that is outside of the lower value limit mayhave relatively strong refractive power to limit optical designs of thesecond to fifth lenses, and the first lens that is outside of the uppervalue limit may have relatively weak refractive power, which may bedisadvantageous in miniaturizing the lens module.

The optical system of the lens module may satisfy the followingConditional Expressions.32.0<V1−V3  [Conditional Expression]30.0<V1−V4  [Conditional Expression]32.0<V1−V5  [Conditional Expression]

Here, V1 is an Abbe number of the first lens, V3 is an Abbe number ofthe third lens, V4 is an Abbe number of the fourth lens, and V5 is anAbbe number of the fifth lens.

The Conditional Expressions above may be conditions for facilitating anoptical design of the first lens. For example, the third to fifth lensessatisfying the Conditional Expressions above may have a refractive indexlarger than that of the first lens, and therefore the manufacturingthereof may be performed in various forms while ensuring a degree offreedom in a design of the first lens.

The second to fifth lenses of the optical system configuring the lensmodule may satisfy the following Conditional Expressions.0.9<f2/f  [Conditional Expression]f3/f<−0.9  [Conditional Expression]3.0<f4/f  [Conditional Expression]f5/f<−3.0  [Conditional Expression]

Here, f2 is a focal length [mm] of the second lens, f3 is a focal length[mm] of the third lens, f4 is a focal length [mm] of the fourth lens, f5is a focal length [mm] of the fifth lens, and f is the overall focallength [mm] of the lens module.

The Conditional Expressions above may provide refractive power ranges ofthe second to fifth lenses, in which a length of the optical system maybe shortened.

The optical system of the lens module may satisfy the followingConditional Expression.1.1<OAL/f  [Conditional Expression]

Here, OAL is a distance [mm] from an object-side surface of the firstlens to the image-sensing surface, and f is the overall focal length[mm] of the lens module.

The first to third lenses of the optical system configuring the lensmodule may satisfy the following Conditional Expressions.1.4<f1/f2<5.0  [Conditional Expression]f2/f3<0.8  [Conditional Expression]

Here, f1 is the focal length [mm] of the first lens, f2 is the focallength [mm] of the second lens, and f3 is the focal length [mm] of thethird lens.

The Conditional Expressions above may be conditions for optimizingoptical designs of the first to third lenses. For example, when thesecond lens is designed in a range in which all of the ConditionalExpressions above are satisfied, degrees of freedom of the first andthird lenses may be increased, and the first and third lenses may bevariously modified or implemented.

The optical system of the lens module may satisfy the followingConditional Expressions.0.25<BFL/f<0.35  [Conditional Expression]0.02<D12/f  [Conditional Expression]0.3<r1/f<0.8  [Conditional Expression]2.0<r5/f  [Conditional Expression]

Here, BFL is a distance [mm] from an image-side surface of the sixthlens to the image-sensing surface, D12 is an air gap [mm] or anoptical-axis distance between the first and second lenses, r1 is aradius [mm] of curvature of the object-side surface of the first lens,r5 is a radius [mm] of curvature of an object-side surface of the thirdlens, and f is the overall focal length [mm] of the lens module.

The Conditional Expressions above may be conditions for optimizing sizesof BFL, D12, r1, r5 having an influence on the overall focal length ofthe optical system.

The optical system of the lens module may satisfy the followingConditional Expression.0.1<EPD/2/f1  [Conditional Expression]

Here, EPD/2 is a radius [mm] of an entrance pupil having an entrancepupil diameter (EPD), and f1 is the focal length [mm] of the first lens.

The optical system of the lens module may satisfy the followingConditional Expression.0.75<OAL/ImgH/2<0.85  [Conditional Expression]

Here, OAL is the distance [mm] from an object-side surface of the firstlens to the image-sensing surface, and ImgH is a maximum height [mm] ofan image that may be imaged by the lens module.

Next, the optical system configuring the lens module will hereinafter bedescribed.

The optical system of the lens module may be manufactured in thefollowing manner.

For example, the optical system of the lens module may include a firstlens having refractive power and an object-side surface thereof beingconvex, a second lens having refractive power and an object-side surfacethereof being convex, a third lens having refractive power and anobject-side surface thereof being convex, a fourth lens havingrefractive power and both surfaces thereof being convex, a fifth lenshaving refractive power and an image-side surface thereof being convex,and a sixth lens having refractive power and an image-side surfacethereof being concave. One or more inflection points may be formed onthe image-side surface of the sixth lens.

As another example, the optical system of the lens module may include afirst lens having positive refractive power, a second lens havingpositive refractive power, a third lens having refractive power and animage-side surface thereof being convex, a fourth lens having refractivepower, a fifth lens having negative refractive power, and a sixth lenshaving refractive power. One or more inflection points may be formed onan image-side surface of the sixth lens.

As yet another example, the optical system of the lens module mayinclude a first lens having positive refractive power, a second lenshaving positive refractive power, a third lens having refractive powerand an image-side surface thereof being convex, a fourth lens havingpositive refractive power and an object-side surface thereof beingconvex, a fifth lens having refractive power, and a sixth lens havingrefractive power. One or more inflection points may be formed on animage-side surface of the sixth lens.

The lenses and an image sensor configuring the optical system willhereinafter be described.

The first lens may have refractive power. For example, the first lensmay have positive refractive power. However, the first lens may havenegative refractive power.

The first lens may have a first surface (object-side surface) that isconvex. For example, the first lens may have the first surface that isconvex and a second surface (image-side surface) that is concave. Thefirst lens may have positive or negative refractive power as long as itsatisfies the above-mentioned shape.

The first lens may have at least one aspherical surface. For example,both surfaces of the first lens may be aspherical. The first lens may beformed of a material having relatively high light transmissivity and/orexcellent workability. For example, the first lens may be formed using aplastic material. However, a material of the first lens is not limitedto a plastic material. For example, the first lens may be formed usingglass.

The second lens may have refractive power. For example, the second lensmay have positive refractive power. However, the second lens may havenegative refractive power. In addition, the second lens may haverefractive power stronger than that of the first lens. For example, thesecond lens may have a focal length shorter than that of the first lens.For example, the second lens may satisfy the following ConditionalExpression.f2<f1  [Conditional Expression]

Here, f1 is a focal length of the first lens, and f2 is a focal lengthof the second lens.

The second lens may have biconvex surfaces or both surfaces that areconvex. For example, a first surface of the second lens may be convextoward an object, and a second surface of the second lens may be convextoward an image. The second lens may have positive or negativerefractive power as long as it satisfies the above-mentioned shape.

The second lens may have an aspherical surface. For example, one or bothsurfaces of the second lens may be aspherical. The second lens may beformed of a material having relatively high light transmissivity and/orexcellent workability. For example, the second lens may be formed usinga plastic material. However, a material of the second lens is notlimited to plastic. For example, the second lens may be formed usingglass.

The third lens may have refractive power. For example, the third lensmay have negative refractive power. However, the third lens may havepositive refractive power. In addition, the third lens may haverefractive power (for reference, refractive power is an inverse numberof a focal length) weaker than those of the fifth and sixth lenses. Forexample, the third lens may satisfy the following ConditionalExpressions.f5<f3  [Conditional Expression]f6<f3  [Conditional Expression]

Here, f3 is a focal length of the third lens, f5 is a focal length ofthe fifth lens, and f6 is a focal length of the sixth lens.

The third lens may have a meniscus shape which may be convex toward theobject. For example, the third lens may have a first surface that isconvex toward the object and a second surface that is concave toward theimage. The third lens may have positive or negative refractive power aslong as it satisfies the above-mentioned shape.

The third lens may have at least one aspherical surface. For example,one or both surfaces of the third lens may be aspherical. The third lensmay be formed of a material having relatively high light transmissivityand/or excellent workability. For example, the third lens may be formedusing a plastic material. However, a material of the third lens is notlimited to plastic. For example, the third lens may be formed usingglass. In addition, the third lens may be formed of a material having arelatively high refractive index. For example, the third lens may beformed of a material having a refractive index of 1.60 or more (in thiscase, the third lens may have an Abbe number of 30 or less). The thirdlens formed of this material may easily refract light even in arelatively small curvature shape. Therefore, the third lens formed ofthis material may be easily manufactured and may lower a defect ratewith regard to manufacturing tolerance. In addition, the third lensformed of this material may allow a distance between lenses to bedecreased, such that the lens module may be miniaturized.

The third lens may have a size smaller than at least one or both of thefirst and second lenses. For example, an effective diameter (forexample, a diameter of a portion at which effective light issubstantially incident and refracted) of the third lens may be smallerthan one or both of the first and second lenses.

The fourth lens may have refractive power. For example, the fourth lensmay have positive refractive power. However, the fourth lens may havenegative refractive power.

The fourth lens may have biconvex surfaces. For example, a first surfaceof the fourth lens may be convex toward the object, and a second surfaceof the fourth lens may be convex toward the image. The fourth lens mayhave positive or negative refractive power as long as it satisfies theabove-mentioned shape.

The fourth lens may have at least one aspherical surface. For example,one or both surfaces of the fourth lens may be aspherical. The fourthlens may be formed of a material having relatively high lighttransmissivity and/or excellent workability. For example, the fourthlens may be formed using a plastic material. However, a material of thefourth lens is not limited to plastic. For example, the fourth lens maybe formed using glass. In addition, the fourth lens may be formed of amaterial having a high refractive index. For example, the fourth lensmay be formed of a material having a refractive index of 1.60 or more(in this case, the fourth lens may have an Abbe number of 30 or less).The fourth lens formed of this material may easily refract light even ina small curvature shape. Therefore, the fourth lens formed of thismaterial may be easily manufactured and may lower a defect rate withregard to manufacturing tolerance. In addition, the fourth lens formedof this material may allow a distance between lenses to be decreased,such that the lens module may be miniaturized.

The fifth lens may have refractive power. For example, the fifth lensmay have negative refractive power. However, the fifth lens may havepositive refractive power.

An image-side surface of the fifth lens may be convex. For example, thefifth lens may have a first surface that is concave toward the objectand a second surface that is convex toward the image. The fifth lens mayhave positive or negative refractive power as long as it satisfies theabove-mentioned shape.

The fifth lens may have at least one aspherical surface. For example,one or both surfaces of the fifth lens may be aspherical. The fifth lensmay be formed of a material having relatively high light transmissivityand/or excellent workability. For example, the fifth lens may be formedusing a plastic material. However, a material of the fifth lens is notlimited to plastic. For example, the fifth lens may be formed usingglass. In addition, the fifth lens may be formed of a material having ahigh refractive index. For example, the fifth lens may be formed of amaterial having a refractive index of 1.60 or more (in this case, thefifth lens may have an Abbe number of 30 or less). The fifth lens formedof this material may easily refract light even in a small curvatureshape. Therefore, the fifth lens formed of this material may be easilymanufactured and may lower a defect rate with regard to manufacturingtolerance. In addition, the fifth lens formed of this material may allowa distance between lenses to be decreased, such that the lens module maybe miniaturized.

The sixth lens may have refractive power. For example, the sixth lensmay have negative refractive power. However, the sixth lens may havepositive refractive power.

An image-side surface of the sixth lens may be concave. For example, thesixth lens may have a first surface that is convex toward the object anda second surface that is concave toward the image. The sixth lens mayhave positive or negative refractive power as long as it satisfies theabove-mentioned shape.

The sixth lens may have at least one aspherical surface. For example,one or both surfaces of the sixth lens may be aspherical. In addition,the sixth lens may be formed to include at least one or more inflectionpoints on one or both surfaces thereof. For example, the first surfaceof the sixth lens may be convex on an optical axis, and be concave inthe vicinity of the optical axis. Additionally, the first surface of thesixth lens be convex at an edge thereof. The second surface of the sixthlens may be concave on an optical axis and become convex toward an edgethereof. The second surface of the sixth lens may be convex toward theimage at the periphery. The sixth lens may be formed of a materialhaving relatively high light transmissivity and/or excellentworkability. For example, the sixth lens may be formed using a plasticmaterial. However, a material of the sixth lens is not limited toplastic. For example, the sixth lens may be formed using glass.

The image sensor (or image-sensing surface) may have a diameter smallerthan effective diameters of one or more lenses. For example, ahorizontal length or a vertical length of the image sensor may besmaller than an effective diameter of the image-side surface of thesixth lens. A deviation between a diagonal length of the image sensorand the effective diameter of the image-side surface of the sixth lensmay be, for instance, but not limited to, 0.50 [mm] or more. This sizelimitation of the image sensor may be advantageous to a lens modulehaving a handshaking correction function.

The image sensor may be configured to implement high resolution of, forexample, but not limited to, 1300 megapixels. For example, a unit sizeof the pixels configuring the image sensor may be 1.12 μm or less.

The optical system of the lens module may be configured so thateffective diameters of the lenses become smaller from the first lenstoward the third lens and/or be increased from the fourth lens towardthe sixth lens. The optical system configured as described above mayincrease an amount of light incident to the image sensor to increaseresolution of the lens module.

The optical system of the lens module may be configured to have a low FNo. For example, the optical system of the lens module may have an F No.of 2.3 or less. The optical system of the lens module may be configuredto have a relatively short length (OAL). For example, OAL of the lensmodule may be 5.0 [mm] or less.

The lens module configured as described above may allow for reduction ofaberration causing image quality deterioration. In addition, the lensmodule of embodiments of the present disclosure may be provided toimplement high resolution. Further, the lens module configured asdescribed above may be easily lightened and may reduce manufacturingcosts.

A lens module according to a first exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 1.

A lens module 100 may include an optical system including a first lens110, a second lens 120, a third lens 130, a fourth lens 140, a fifthlens 150, and a sixth lens 160. In addition, the lens module 100 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Additionally, the lens module 100 may further include at least one stop.For example, the stop may be disposed between the second and thirdlenses 120 and 130. However, the stop may be disposed in front of thefirst lens 110, between the first lens 110 and the second lens 120 oranywhere between the third lens 130 and the sixth lens 160.

In the exemplary embodiment of the present disclosure, the first lens110 may have positive refractive power. An object-side surface of thefirst lens 110 may be convex and an image-side surface of the first lens110 may be concave. However, the first lens 110 may have negativerefractive power. The second lens 120 may have positive refractivepower. An object-side surface of the second lens 120 may be convex andan image-side surface of the second lens 120 may be convex. However, thesecond lens 120 may have negative refractive power. The third lens 130may have negative refractive power. An object-side surface of the thirdlens 130 may be convex and an image-side surface of the third lens 130may be concave. However, the third lens 130 may have positive refractivepower. The fourth lens 140 may have positive refractive power. Anobject-side surface of the fourth lens 140 may be convex and animage-side surface of the fourth lens 140 may be convex. However, thefourth lens 140 may have negative refractive power. The fifth lens 150may have negative refractive power. An object-side surface of the fifthlens 150 may be concave and an image-side surface of the fifth lens 150may be convex. However, the fifth lens 150 may have positive refractivepower. The sixth lens 160 may have negative refractive power. Anobject-side surface of the sixth lens 160 may be convex and animage-side surface of the sixth lens 160 may be concave. However, thesixth lens 160 may have positive refractive power. In addition, thesixth lens 160 may have one or more inflection points formed on at leastone or each of the object-side surface and the image-side surfacethereof.

Aberration characteristics of the lens module 100 will hereinafter bedescribed with reference to FIG. 2.

The lens module 100 may have astigmatism and distortion curves asillustrated in FIG. 2.

Exemplary characteristics of the optical system configuring the lensmodule 100 will hereinafter be described with reference to FIG. 3.

In FIG. 3, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 110, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 120, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 130 to 160, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 100of the first exemplary embodiment will hereinafter be described withreference to FIG. 4.

In FIG. 4, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 110 to 160, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a second exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 5.

A lens module 200 may include an optical system including a first lens210, a second lens 220, a third lens 230, a fourth lens 240, a fifthlens 250, and a sixth lens 260. In addition, the lens module 200 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 200 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses220 and 230. However, the stop may be disposed in front of the firstlens 210, between the first lens 210 and the second lens 220 or anywherebetween the third lens 230 and the sixth lens 260.

In the exemplary embodiment of the present disclosure, the first lens210 may have positive refractive power. An object-side surface of thefirst lens 210 may be convex and an image-side surface of the first lens210 may be concave. However, the first lens 210 may have negativerefractive power. The second lens 220 may have positive refractivepower. An object-side surface of the second lens 220 may be convex andan image-side surface of the second lens 220 may be convex. However, thesecond lens 220 may have negative refractive power. The third lens 230may have negative refractive power. An object-side surface of the thirdlens 230 may be convex and an image-side surface of the third lens 230may be concave. However, the third lens 230 may have positive refractivepower. The fourth lens 240 may have positive refractive power. Anobject-side surface of the fourth lens 240 may be convex and animage-side surface of the fourth lens 240 may be convex. However, thefourth lens 240 may have negative refractive power. The fifth lens 250may have negative refractive power. An object-side surface of the fifthlens 250 may be concave and an image-side surface of the fifth lens 250may be convex. The sixth lens 260 may have negative refractive power.However, the sixth lens 260 may have positive refractive power. Anobject-side surface of the sixth lens 260 may be convex and animage-side surface of the sixth lens 260 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens260.

Aberration characteristics of the lens module 200 will hereinafter bedescribed with reference to FIG. 6.

The lens module 200 may have astigmatism and distortion curves asillustrated in FIG. 6.

Exemplary characteristics of the optical system configuring the lensmodule 200 will hereinafter be described with reference to FIG. 7.

In FIG. 7, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 210, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 220, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 230 to 260, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 200of the second embodiment will hereinafter be described with reference toFIG. 8.

In FIG. 8, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 210 to 260, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a third exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 9.

A lens module 300 may include an optical system including a first lens310, a second lens 320, a third lens 330, a fourth lens 340, a fifthlens 350, and a sixth lens 360. In addition, the lens module 300 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 300 may further include one or more stops. Forexample, the stop may be disposed between the second and third lenses320 and 330. However, the stop may be disposed in front of the firstlens 310, between the first lens 310 and the second lens 320 or anywherebetween the third lens 330 and the sixth lens 360.

In the exemplary embodiment of the present disclosure, the first lens310 may have positive refractive power. However, the first lens 310 mayhave negative refractive power. An object-side surface of the first lens310 may be convex and an image-side surface of the first lens 310 may beconcave. The second lens 320 may have positive refractive power.However, the second lens 320 may have negative refractive power. Anobject-side surface of the second lens 320 may be convex and animage-side surface of the second lens 320 may be convex. The third lens330 may have negative refractive power. However, the third lens 330 mayhave positive refractive power. An object-side surface of the third lens330 may be convex and an image-side surface of the third lens 330 may beconcave. The fourth lens 340 may have positive refractive power.However, the fourth lens 340 may have negative refractive power. Anobject-side surface of the fourth lens 340 may be convex and animage-side surface of the fourth lens 340 may be convex. The fifth lens350 may have negative refractive power. However, the fifth lens 350 mayhave positive refractive power. An object-side surface of the fifth lens350 may be concave and an image-side surface of the fifth lens 350 maybe convex. The sixth lens 360 may have negative refractive power.However, the sixth lens 360 may have positive refractive power. Anobject-side surface of the sixth lens 360 may be convex and animage-side surface of the sixth lens 360 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens360.

Aberration characteristics of the lens module 300 of the thirdembodiment will hereinafter be described with reference to FIG. 10.

The lens module 300 may decrease astigmatism at an edge portion of theimage-sensing surface, as illustrated in FIG. 10.

Exemplary characteristics of the optical system configuring the lensmodule 300 will hereinafter be described with reference to FIG. 11.

In FIG. 11, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 310, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 320, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 330 to 360, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 300will hereinafter be described with reference to FIG. 12.

In FIG. 12, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 310 to 360, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a fourth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 13.

A lens module 400 may include an optical system including a first lens410, a second lens 420, a third lens 430, a fourth lens 440, a fifthlens 450, and a sixth lens 460. In addition, the lens module 400 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 400 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses420 and 430. However, the stop may be disposed in front of the firstlens 410, between the first lens 410 and the second lens 420 or anywherebetween the third lens 430 and the sixth lens 460.

In the exemplary embodiment of the present disclosure, the first lens410 may have positive refractive power. However, the first lens 410 mayhave negative refractive power. An object-side surface of the first lens410 may be convex and an image-side surface of the first lens 410 may beconcave. The second lens 420 may have positive refractive power.However, the second lens 420 may have negative refractive power. Anobject-side surface of the second lens 420 may be convex and animage-side surface of the second lens 420 may be convex. The third lens430 may have negative refractive power. However, the third lens 430 mayhave positive refractive power. An object-side surface of the third lens430 may be convex and an image-side surface of the third lens 430 may beconcave. The fourth lens 440 may have positive refractive power.However, the fourth lens 440 may have negative refractive power. Anobject-side surface of the fourth lens 440 may be convex and animage-side surface of the fourth lens 440 may be convex. The fifth lens450 may have negative refractive power. However, the fifth lens 450 mayhave positive refractive power. An object-side surface of the fifth lens450 may be concave and an image-side surface of the fifth lens 450 maybe convex. The sixth lens 460 may have negative refractive power.However, the sixth lens 460 may have positive refractive power. Anobject-side surface of the sixth lens 460 may be convex and animage-side surface of the sixth lens 460 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens460.

Aberration characteristics of the lens module 400 of the fourthembodiment will hereinafter be described with reference to FIG. 14.

The lens module 400 may decrease astigmatism at an edge portion of theimage-sensing surface, as illustrated in FIG. 14.

Exemplary characteristics of the optical system configuring the lensmodule 400 will hereinafter be described with reference to FIG. 15.

In FIG. 15, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 410, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 420, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 430 to 460, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 400will hereinafter be described with reference to FIG. 16.

In FIG. 16, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 410 to 460, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a fifth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 17.

A lens module 500 may include an optical system including a first lens510, a second lens 520, a third lens 530, a fourth lens 540, a fifthlens 550, and a sixth lens 560. In addition, the lens module 500 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 500 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses520 and 530. However, the stop may be disposed in front of the firstlens 510, between the first lens 510 and the second lens 520 or anywherebetween the third lens 530 and the sixth lens 560.

In the exemplary embodiment of the present disclosure, the first lens510 may have positive refractive power. However, the first lens 510 mayhave negative refractive power. An object-side surface of first lens 510may be convex and an image-side surface of the first lens 510 may beconcave. The second lens 520 may have positive refractive power.However, the second lens 520 may have negative refractive power. Anobject-side surface of the second lens 520 may be convex while animage-side surface of the second lens 520 may be convex. The third lens530 may have negative refractive power. However, the third lens 530 mayhave positive refractive power. An object-side surface of the third lens530 may be convex and an image-side surface of the third lens 530 may beconcave. The fourth lens 540 may have positive refractive power.However, the fourth lens 540 may have negative refractive power. Anobject-side surface of the fourth lens 540 may be convex and animage-side surface of the fourth lens 540 may be convex. The fifth lens550 may have negative refractive power. However, the fifth lens 550 mayhave positive refractive power. An object-side surface of the fifth lens550 may be concave and an image-side surface of the fifth lens 550 maybe convex. The sixth lens 560 may have negative refractive power.However, the sixth lens 560 may have positive refractive power. Anobject-side surface of the sixth lens 560 may be convex and animage-side surface of the sixth lens 560 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens560.

Aberration characteristics of the lens module 500 of the fifth exemplaryembodiment will hereinafter be described with reference to FIG. 18.

The lens module 500 may have substantially constant astigmatism from thecenter of the image-sensing surface to an edge thereof, as illustratedin FIG. 18.

Exemplary characteristics of the optical system configuring the lensmodule 500 will hereinafter be described with reference to FIG. 19.

In FIG. 19, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 510, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 520, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 530 to 560, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 500of the fifth exemplary embodiment will hereinafter be described withreference to FIG. 20.

In FIG. 20, a horizontal axis the table refers to Surface Nos. of thefirst to sixth lenses 510 to 560, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a sixth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 21.

A lens module 600 may include an optical system including a first lens610, a second lens 620, a third lens 630, a fourth lens 640, a fifthlens 650, and a sixth lens 660. In addition, the lens module 600 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 600 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses620 and 630. However, the stop may be disposed in front of the firstlens 610, between the first lens 610 and the second lens 620 or anywherebetween the third lens 630 and the sixth lens 660.

In the exemplary embodiment of the present disclosure, the first lens610 may have positive refractive power. However, the first lens 610 mayhave negative refractive power. An object-side surface of the first lens610 may be convex and an image-side surface of the first lens 610 may beconcave. The second lens 620 may have positive refractive power.However, the second lens 620 may have positive refractive power. Anobject-side surface of the second lens 620 may be convex and animage-side surface of the second lens 620 may be convex. The third lens630 may have negative refractive power. However, the third lens 630 mayhave negative refractive power. An object-side surface of the third lens630 may be convex and an image-side surface of the third lens 630 may beconcave. The fourth lens 640 may have positive refractive power.However, the fourth lens 640 may have negative refractive power. Anobject-side surface of the fourth lens 640 may be convex and animage-side surface of the fourth lens 640 may be convex. The fifth lens650 may have negative refractive power. However, the fifth lens 650 mayhave positive refractive power. An object-side surface of the fifth lens650 may be concave and an image-side surface of the fifth lens 650 maybe convex. The sixth lens 660 may have negative refractive power.However, the sixth lens 660 may have positive refractive power. Anobject-side surface of the sixth lens 660 may be convex and animage-side surface of the sixth lens 660 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens660.

Aberration characteristics of the lens module 600 of the sixth exemplaryembodiment will hereinafter be described with reference to FIG. 22.

The lens module 600 may have substantially constant astigmatism from thecenter of the image-sensing surface to an edge thereof, as illustratedin FIG. 22.

Exemplary characteristics of the optical system configuring the lensmodule 600 will hereinafter be described with reference to FIG. 23.

In FIG. 23, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 610, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 620, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 630 to 660, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 600of the sixth exemplary embodiments will hereinafter be described withreference to FIG. 24.

In FIG. 24, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 610 to 660, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a seventh exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 25.

A lens module 700 may include an optical system including a first lens710, a second lens 720, a third lens 730, a fourth lens 740, a fifthlens 750, and a sixth lens 760. In addition, the lens module 700 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 700 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses720 and 730. However, the stop may be disposed in front of the firstlens 710, between the first lens 710 and the second lens 720 or anywherebetween the third lens 730 and the sixth lens 760.

In the exemplary embodiment of the present disclosure, the first lens710 may have positive refractive power. However, the first lens 710 mayhave negative refractive power. An object-side surface of the first lens710 may be convex and an image-side surface of the first lens 710 may beconcave. The second lens 720 may have positive refractive power.However, the second lens 720 may have negative refractive power. Anobject-side surface of the second lens 720 may be convex and animage-side surface of the second lens 720 may be convex. The third lens730 may have negative refractive power. However, the third lens 730 mayhave positive refractive power. An object-side surface of the third lens730 may be convex and an image-side surface of the third lens 730 may beconcave. The fourth lens 740 may have positive refractive power.However, the fourth lens 740 may have negative refractive power. Anobject-side surface of the fourth lens 740 may be convex and animage-side surface of the fourth lens 740 may be convex. The fifth lens750 may have negative refractive power. However, the fifth lens 750 mayhave positive refractive power. An object-side surface of the fifth lens750 may be concave and an image-side surface of the fifth lens 750 maybe convex. The sixth lens 760 may have negative refractive power.However, the sixth lens 760 may have positive refractive power. Anobject-side surface of the sixth lens 760 may be convex and animage-side surface of the sixth lens 760 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens760.

Aberration characteristics of the lens module 700 of the seventhexemplary embodiment will hereinafter be described with reference toFIG. 26.

The lens module 700 may have substantially constant astigmatism from thecenter of the image-sensing surface to an edge thereof, as illustratedin FIG. 26.

Exemplary characteristics of the optical system configuring the lensmodule 700 will hereinafter be described with reference to FIG. 27.

In FIG. 27, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 710, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 720, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 730 to 760, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 700of the seventh exemplary embodiment will hereinafter be described withreference to FIG. 28.

In FIG. 28, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 710 to 760, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

Table 1 (shown below) shows optical characteristics of the lens modulesaccording to the first to seventh exemplary embodiments in the presentdisclosure. As seen in Table 1, the lens modules may substantially havean F No. of 2.00 to 2.35. In addition, the lens module may substantiallyhave an overall focal length (f) of 3.80 to 4.60. In the lens module, afocal length (f1) of the first lens may be substantially within a rangeof 6.0 to 6.9. In the lens module, a focal length (f2) of the secondlens may be substantially within a range of 4.0 to 4.7. In the lensmodule, a focal length (f3) of the third lens may be substantiallywithin a range of −5.4 to −4.0. In the lens module, a focal length (f4)of the fourth lens may be substantially within a range of 19.0 to 32.0.In the lens module, a focal length (f5) of the fifth lens may besubstantially within a range of −230 to −20. In the lens module, a focallength (f6) of the sixth lens may be substantially within a range of−30.0 to −10.0. In the lens module, an overall length of the opticalsystem may be substantially within a range of 4.3 to 5.2. In the lensmodule, BFL may be substantially within a range of 1.04 to 1.29. In thelens module, a field of view (ANG) of the optical system may besubstantially within a range of 64 to 75 degrees. In the lens module, aradius (EPD/2) of an entrance pupil may be substantially within a rangeof 0.9 to 1.0.

TABLE 1 First Second Third Fourth Fifth Sixth Seventh ExemplaryExemplary Exemplary Exemplary Exemplary Exemplary Exemplary EmbodimentEmbodiment Embodiment Embodiment Embodiment Embodiment Embodiment Fno.2.09 2.11 2.12 2.22 2.28 2.30 2.31 f (EFL) 3.971 4.003 4.026 4.210 4.3414.376 4.393 f1 6.480 6.596 6.709 6.601 6.360 6.284 6.487 f2 4.421 4.4754.441 4.326 4.399 4.319 4.170 f3 −5.168 −5.167 −4.954 −4.439 −4.518−4.302 −4.206 f4 21.220 21.433 21.834 24.603 25.577 26.649 29.468 f5−69.28 −95.42 −105.03 −80.31 −23.93 −42.22 −218.80 f6 −14.369 −15.397−18.792 −19.232 −32.481 −18.031 −12.579 OAL 4.570 4.623 4.684 4.8694.970 4.970 4.970 BFL 1.144 1.152 1.159 1.166 1.189 1.172 1.160 ANG71.61 71.08 70.85 68.48 66.77 66.50 66.14 EPD/2 0.95 0.95 0.95 0.95 0.950.95 0.95

Table 2 (shown below) shows numerical ranges of Conditional Expressionsand values of Conditional Expressions of the lens modules according tothe first to seventh exemplary embodiments in the present disclosure.

TABLE 2 First Second Third Fourth Fifth Sixth Seventh ExemplaryExemplary Exemplary Exemplary Exemplary Exemplary Exemplary ConditionalExpression Embodiment Embodiment Embodiment Embodiment EmbodimentEmbodiment Embodiment 1 1.3 < f1/f < 2.5 1.63 1.65 1.67 1.57 1.47 1.441.48 2 32.0 < v1-v3 32.9 32.9 32.9 32.9 32.9 32.9 32.9 3 30.0 < v1-v432.9 32.9 32.9 32.9 32.9 32.9 32.9 4 32.0 < v1-v5 32.9 32.9 32.9 32.932.9 32.9 32.9 5 0.9 < f2/f 1.11 1.12 1.10 1.03 1.01 0.99 0.95 6 f3/f <−0.9 −1.30 −1.29 −1.23 −1.05 −1.04 −0.98 −0.96 7 3.0 < f4/f 5.34 5.355.42 5.84 5.89 6.09 6.71 8 f5/f < −3.0 −17.45 −23.84 −26.09 −19.08 −5.51−9.65 −49.81 9 1.1 < OAL/f 1.15 1.15 1.16 1.16 1.14 1.14 1.13 10 1.4 <f1/f2 < 5.0 1.47 1.47 1.51 1.53 1.45 1.45 1.56 11 f2/f3 < 0.8 −0.86−0.87 −0.90 −0.97 −0.97 −1.00 −0.99 12 0.25 < BFL/f < 0.35 0.29 0.290.29 0.28 0.27 0.27 0.26 13 0.02 < D12/f 0.03 0.02 0.02 0.02 0.02 0.020.02 14 0.3 < r1/f < 0.8 0.41 0.41 0.41 0.41 0.40 0.39 0.39 15 2.0 <r5/f 3.42 4.71 5.25 7.87 8.77 9.11 8.22 16 4.0 < r9/f 10.24 7.49 4.975.21 4.01 4.42 4.60 17 0.1 < EPD/2/f1 0.15 0.14 0.14 0.14 0.15 0.15 0.1518 0.75 < AL/ImgH, < 0.85 0.78 0.79 0.80 0.83 0.83 0.85 0.85

As seen in Table 2, the lens modules according to first to seventhexemplary embodiments in the present disclosure may satisfy at least oneor all of the Conditional Expressions.

A lens module according to an eighth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 29.

A lens module 800 may include an optical system including a first lens810, a second lens 820, a third lens 830, a fourth lens 840, a fifthlens 850, and a sixth lens 860. In addition, the lens module 800 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 800 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses820 and 830. However, the stop may be disposed in front of the firstlens 810, between the first lens 810 and the second lens 820 or anywherebetween the third lens 830 and the sixth lens 860.

In the exemplary embodiment of the present disclosure, the first lens810 may have positive refractive power. However, the first lens 810 mayhave negative refractive power. An object-side surface of the first lens810 may be convex and an image-side surface of the first lens 810 may beconcave. The second lens 820 may have positive refractive power.However, the second lens 820 may have negative refractive power. Anobject-side surface of the second lens 820 may be convex and animage-side surface of the second lens 820 may be convex. The third lens830 may have negative refractive power. However, the third lens 830 mayhave positive refractive power. An object-side surface of the third lens830 may be convex and an image-side surface of the third lens 830 may beconcave. The fourth lens 840 may have positive refractive power.However, the fourth lens 840 may have negative refractive power. Anobject-side surface of the fourth lens 840 may be convex and animage-side surface of the fourth lens 840 may be convex. The fifth lens850 may have positive refractive power. However, the fifth lens 850 mayhave negative refractive power. An object-side surface of the fifth lens850 may be concave and an image-side surface of the fifth lens 850 maybe convex. The sixth lens 860 may have negative refractive power.However, the sixth lens 860 may have positive refractive power. Anobject-side surface of the sixth lens 860 may be convex and animage-side surface of the sixth lens 860 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens860.

Aberration characteristics of the lens module 800 of the eighthexemplary embodiment will hereinafter be described with reference toFIG. 30.

The lens module 800 may have substantially constant astigmatism from thecenter of the image-sensing surface to an edge thereof, as illustratedin FIG. 30.

Exemplary characteristics of the optical system configuring the lensmodule 800 will hereinafter be described with reference to FIG. 31.

In FIG. 31, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 810, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 820, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 830 to 860, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 800will hereinafter be described with reference to FIG. 32.

In FIG. 32, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 810 to 860, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

A lens module according to a ninth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 33.

A lens module 900 may include an optical system including a first lens910, a second lens 920, a third lens 930, a fourth lens 940, a fifthlens 950, and a sixth lens 960. In addition, the lens module 900 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 900 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses920 and 930. However, the stop may be disposed in front of the firstlens 910, between the first lens 910 and the second lens 920 or anywherebetween the third lens 930 and the sixth lens 960.

In the exemplary embodiment of the present disclosure, the first lens910 may have positive refractive power. However, the first lens 910 mayhave negative refractive power. An object-side surface of the first lens910 may be convex and an image-side surface of the first lens 910 may beconcave. The second lens 920 may have positive refractive power.However, the second lens 920 may have negative refractive power. Anobject-side surface of the second lens 920 may be convex and animage-side surface of the second lens 920 may be convex. The third lens930 may have negative refractive power. However, the third lens 930 mayhave positive refractive power. An object-side surface of the third lens930 may be convex and an image-side surface of the third lens 930 may beconcave. The fourth lens 940 may have positive refractive power.However, the fourth lens 940 may have negative refractive power. Anobject-side surface of the fourth lens 940 may be convex and animage-side surface of the fourth lens 940 may be convex. The fifth lens950 may have negative refractive power. However, the fifth lens 950 mayhave positive refractive power. An object-side surface of the fifth lens950 may be concave and an image-side surface of the fifth lens 950 maybe convex. The sixth lens 960 may have positive refractive power.However, the sixth lens 960 may have negative refractive power. Anobject-side surface of the sixth lens 960 may be convex and animage-side surface of the sixth lens 960 may be concave. In addition,one or more inflection points may be formed on at least one or each ofthe object-side surface and the image-side surface of the sixth lens960.

Aberration characteristics of the lens module 900 of the ninth exemplaryembodiment will hereinafter be described with reference to FIG. 34.

The lens module 900 may have substantially constant astigmatism from thecenter of the image-sensing surface to an edge thereof, as illustratedin FIG. 34.

Exemplary characteristics of the optical system configuring the lensmodule 900 will hereinafter be described with reference to FIG. 35.

In FIG. 35, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 910, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 920, respectively. In asimilar scheme, Surface Nos. 7 to 14 indicate first and second surfacesof the third to sixth lenses 930 to 960, respectively. Meanwhile,Surface No. 6 indicates the stop, and Surface Nos. 15 and 16 indicatefirst and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 900will hereinafter be described with reference to FIG. 36.

In FIG. 36, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 910 to 960, and a vertical axis refers tocharacteristics corresponding to each lens surface.

A lens module according to a tenth exemplary embodiment of the presentdisclosure will hereinafter be described with reference to FIG. 37.

A lens module 1000 may include an optical system including a first lens1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifthlens 1050, and a sixth lens 1060. In addition, the lens module 1000 mayfurther include an infrared cut-off filter 70 and an image sensor 80.Further, the lens module 1000 may further include at least one stop. Forexample, the stop may be disposed between the second and third lenses1020 and 1030. However, the stop may be disposed in front of the firstlens 1010, between the first lens 1010 and the second lens 1020 oranywhere between the third lens 1030 and the sixth lens 1060.

In the exemplary embodiment of the present disclosure, the first lens1010 may have positive refractive power. However, the first lens 1010may have negative refractive power. An object-side surface of the firstlens 1010 may be convex and an image-side surface of the first lens 1010may be concave. The second lens 1020 may have positive refractive power.However, the second lens 1020 may have negative refractive power. Anobject-side surface of the second lens 1020 may have positive refractivepower may be convex and an image-side surface of the second lens 1020may be convex. The third lens 1030 may have negative refractive power.However, the third lens 1030 may have positive refractive power. Anobject-side surface of the third lens 1030 may be convex and animage-side surface of the third lens 1030 may be concave. The fourthlens 1040 may have positive refractive power. However, the fourth lens1040 may have negative refractive power. An object-side surface of thefourth lens 1040 may be convex and an image-side surface of the fourthlens 1040 may be convex. The fifth lens 1050 may have negativerefractive power. However, the fifth lens 1050 may have positiverefractive power. An object-side surface of the fifth lens 1050 may beconcave while an image-side surface of the fifth lens 1050 may beconvex. The sixth lens 1060 may have positive refractive power. However,the sixth lens 1060 may have negative refractive power. An object-sidesurface of the sixth lens 1060 may be convex and an image-side surfaceof the sixth lens 1060 may be concave. In addition, one or moreinflection points may be formed on at least one or each of theobject-side surface and the image-side surface of the sixth lens 1060.

Aberration characteristics of the lens module 1000 of the tenthexemplary embodiment will hereinafter be described with reference toFIG. 38.

The lens module 1000 may have substantially constant astigmatism fromthe center of the image-sensing surface to an edge thereof, asillustrated in FIG. 38.

Exemplary characteristics of the optical system configuring the lensmodule 1000 will hereinafter be described with reference to FIG. 39.

In FIG. 39, Surface Nos. 2 and 3 indicate the first and second surfacesof the first lens 1010, respectively, and Surface Nos. 4 and 5 indicatethe first and second surfaces of the second lens 1020, respectively. Ina similar scheme, Surface Nos. 7 to 14 indicate first and secondsurfaces of the third to sixth lenses 1030 to 1070, respectively.Meanwhile, Surface No. 6 indicates the stop, and Surface Nos. 15 and 16indicate first and second surfaces of the infrared cut-off filter 70.

Aspherical values of the optical system configuring the lens module 1000of the tenth exemplary embodiment will hereinafter be described withreference to FIG. 40.

In FIG. 40, a horizontal axis of the table refers to Surface Nos. of thefirst to sixth lenses 1010 to 1060, and a vertical axis of the tablerefers to characteristics corresponding to each lens surface.

Table 3 (shown below) shows optical characteristics of the lens modulesaccording to the eighth to tenth exemplary embodiments in the presentdisclosure. As seen in Table 3, the lens modules may substantially havean F No. of 2.10 to 2.3. In addition, the lens module may substantiallyhave an overall focal length (f) of 4.0 to 4.3. In the lens module, afocal length (f1) of the first lens may be substantially within a rangeof 5.6 to 6.6. In the lens module, a focal length (f2) of the secondlens may be substantially within a range of 4.0 to 4.9. In the lensmodule, a focal length (f3) of the third lens may be substantiallywithin a range of −4.6 to −4.1. In the lens module, a focal length (f4)of the fourth lens may be substantially within a range of 20.0 to 23.0.In the lens module, a focal length (f5) of the fifth lens may besubstantially within a range of −30 to 30. In the lens module, a focallength (f6) of the sixth lens may be substantially within a range of−10.0 to 110.0. In the lens module, an overall length of the opticalsystem may be substantially within a range of 4.5 to 5.0. In the lensmodule, BFL may be substantially within a range of 1.0 to 1.4. In thelens module, a field of view (ANG) of the optical system may besubstantially within a range of 68 to 72 degrees. In the lens module, aradius (EPD/2) of an entrance pupil may be substantially within a rangeof 0.6 to 0.8.

TABLE 3 Eighth Exemplary Ninth Exemplary Tenth Exemplary EmbodimentEmbodiment Embodiment Fno. 2.16 2.15 2.19 f (EFL) 4.106 4.096 4.163 f16.442 6.229 5.749 f2 4.284 4.474 4.790 f3 −4.519 −4.411 −4.232 f4 21.4321.43 21.43 f5 26.11 −27.49 −28.67 f6 −7.751 999.8 99.98 OAL 4.724 4.7544.806 BFL 1.102 1.275 1.327 ANG 69.7 69.8 69.0 EPD/2 0.67 0.68 0.67

Table 4 (shown below) shows numerical ranges of Conditional Expressionsand values of Conditional Expressions of the lens modules according tothe eighth to tenth exemplary embodiments in the present disclosure.

TABLE 4 Eight Ninth Tenth Conditional Exemplary Exemplary ExemplaryExpression Embodiment Embodiment Embodiment 1  1.3 < f1/f < 2.5 1.571.52 1.38 2 32.0 < v1-v3 32.9 32.9 32.9 3 30.0 < v1-v4 32.9 32.9 32.9 432.0 < v1-v5 32.9 32.9 32.9 5  0.9 < f2/f 1.04 1.09 1.15 6 f3/f < −0.9−1.10 −1.08 −1.02 7  3.0 < f4/f 5.22 5.23 5.15 8 f5/f < −3.0 6.36 −6.71−6.59 9  1.1 < OAL/f 1.14 1.15 1.15 10  1.4 < f1/f2 < 5.0 1.50 1.39 1.2011 f2/f3 < 0.8 −0.95 −1.01 −1.13 12 0.25 < BFL/f < 0.35 0.27 0.31 0.3213 0.02 < D12/f 0.02 0.02 0.03 14  0.3 < r1/f < 0.8 0.40 0.40 0.39 15 2.0 < r5/f 7.31 7.32 7.21 16  4.0 < r9/f 7.31 7.32 7.21 17  0.1 <EPD/2/f1 0.15 0.15 0.17 18 0.75 < AL/ImgH, < 0.85 0.80 0.80 0.81

As seen in Table 4, the lens modules according to the eight to tenthexemplary embodiments in the present disclosure may substantiallysatisfy one or more of the Conditional Expressions above, similar to thelens modules according to the first to seventh exemplary embodiments inthe present disclosure.

As set forth above, according to exemplary embodiments in the presentdisclosure, relatively high resolution may be implemented, and a lengthof the lens module may be shortened.

While exemplary embodiments have been shown and described above, it willbe apparent to those skilled in the art that modifications andvariations could be made without departing from the scope of the presentinvention as defined by the appended claims.

What is claimed is:
 1. A lens module comprising: a first lens comprisingrefractive power and a convex object-side surface; a second lenscomprising refractive power, a convex object-side surface, and a conveximage-side surface; a third lens comprising refractive power and aconvex object-side surface; a fourth lens comprising refractive powerand biconvex surfaces; a fifth lens comprising refractive power and aconvex image-side surface; and a sixth lens comprising refractive powerand a concave image-side surface, one or more inflection points beingformed on the image-side surface of the sixth lens, wherein the first tosixth lenses are sequentially disposed from an object side to an imageside.
 2. The lens module of claim 1, wherein the first lens comprises aconcave image-side surface.
 3. The lens module of claim 1, wherein thethird lens comprises a concave image-side surface.
 4. The lens module ofclaim 1, wherein the fifth lens comprises a concave object-side surface.5. The lens module of claim 1, wherein the sixth lens comprises a convexobject-side surface.
 6. The lens module of claim 1, wherein therefractive power of the fifth lens is negative.
 7. The lens module ofclaim 1, wherein the following Conditional Expression is satisfied:1.3<f1/f<2.5 where f1 is a focal length of the first lens, and f is anoverall focal length of an optical system including the first to sixthlenses.
 8. The lens module of claim 1, wherein the following ConditionalExpression is satisfied:32.0<V1−V3 where V1 is an Abbe number of the first lens, and V3 is anAbbe number of the third lens.
 9. The lens module of claim 1, whereinthe following Conditional Expression is satisfied:30.0<V1−V4 where V1 is an Abbe number of the first lens, and V4 is anAbbe number of the fourth lens.
 10. The lens module of claim 1, whereinthe following Conditional Expression is satisfied:32.0<V1−V5 where V1 is an Abbe number of the first lens, and V5 is anAbbe number of the fifth lens.
 11. The lens module of claim 1, whereinthe following Conditional Expression is satisfied:0.9<f2/f where f2 is a focal length of the second lens, and f is anoverall focal length of an optical system including the first to sixthlenses.
 12. The lens module of claim 1, wherein the followingConditional Expression is satisfied:f3/f<−0.9 where f3 is a focal length of the third lens, and f is anoverall focal length of an optical system including the first to sixthlenses.
 13. The lens module of claim 1, wherein the followingConditional Expression is satisfied:3.0<f4/f where f4 is a focal length of the fourth lens, and f is anoverall focal length of an optical system including the first to sixthlenses.
 14. The lens module of claim 1, wherein the followingConditional Expression is satisfied:f5/f<−3.0 where f5 is a focal length of the fifth lens, and f is anoverall focal length of an optical system including the first to sixthlenses.
 15. The lens module of claim 1, wherein the followingConditional Expression is satisfied:1.1<OAL/f where OAL is a distance from the object-side surface of thefirst lens to an image-sensing surface, and f is an overall focal lengthof an optical system including the first to sixth lenses.
 16. The lensmodule of claim 1, wherein the following Conditional Expression issatisfied:1.4<f1/f2<5.0 where f1 is a focal length of the first lens, and f2 is afocal length of the second lens.
 17. The lens module of claim 1, whereinthe following Conditional Expression is satisfied:f2/f3<0.8 where f2 is a focal length of the second lens, and f3 is afocal length of the third lens.
 18. The lens module of claim 1, whereinthe following Conditional Expression is satisfied:0.25<BFL/f<0.35 where BFL (Back Focus Length) is a distance from theimage-side surface of the sixth lens to an image-sensing surface, and fis an overall focal length of an optical system including the first tosixth lenses.
 19. The lens module of claim 1, wherein the followingConditional Expression is satisfied:0.02<D12/f where D12 is a gap between the first and second lenses, and fis an overall focal length of an optical system including the first tosixth lenses.
 20. The lens module of claim 1, wherein the followingConditional Expression is satisfied:0.3<r1/f<0.8 where r1 is a radius of curvature of the object-sidesurface of the first lens, and f is an overall focal length of anoptical system including the first to sixth lenses.
 21. The lens moduleof claim 1, wherein the following Conditional Expression is satisfied:2.0<r5/f where r5 is a radius of curvature of the object-side surface ofthe third lens, and f is an overall focal length of an optical systemincluding the first to sixth lenses.
 22. The lens module of claim 1,wherein the following Conditional Expression is satisfied:4.0<r7/f where r7 is a radius of curvature of an object-side surface ofthe fourth lens, and f is an overall focal length of an optical systemincluding the first to sixth lenses.
 23. The lens module of claim 1,wherein the following Conditional Expression is satisfied:0.1<EPD/2/f1 where EPD/2 is a radius of an entrance pupil having anentrance pupil diameter (EPD), and f1 is a focal length of the firstlens.
 24. The lens module of claim 1, wherein the following ConditionalExpression is satisfied:0.75<OAL/ImgH/2<0.85 where OAL is a distance from the object-sidesurface of the first lens to an image-sensing surface, and ImgH is amaximum height of an image that can be imaged by the lens module.
 25. Alens module comprising: a first lens comprising refractive power and aconvex object-side surface; a second lens comprising refractive powerand a convex object-side surface; a third lens comprising refractivepower and a convex object-side surface; a fourth lens comprisingrefractive power and biconvex surfaces; a fifth lens comprisingrefractive power and a convex image-side surface; and a sixth lenscomprising refractive power and a concave image-side surface, one ormore inflection points being formed on the image-side surface of thesixth lens, wherein the first to sixth lenses are sequentially disposedfrom an object side to an image side, and wherein the following issatisfied: 0.25<BFL/f<0.35 where BFL (Back Focus Length) is a distancefrom the image-side surface of the sixth lens to an image-sensingsurface, and f is an overall focal length of an optical system includingthe first to sixth lenses.
 26. A lens module comprising: a first lenscomprising refractive power and a convex object-side surface; a secondlens comprising refractive power and a convex object-side surface; athird lens comprising refractive power and a convex object-side surface;a fourth lens comprising refractive power and biconvex surfaces; a fifthlens comprising refractive power and a convex image-side surface; and asixth lens comprising refractive power and a concave image-side surface,one or more inflection points being formed on the image-side surface ofthe sixth lens, wherein the first to sixth lenses are sequentiallydisposed from an object side to an image side, and wherein the followingis satisfied: 0.75<OAL/ImgH/2<0.85 where OAL is a distance from theobject-side surface of the first lens to an image-sensing surface, andImgH is a maximum height of an image that can be imaged by the lensmodule.